Steam-pump



(No Model.)

M. SCHULTZ. Steam Pump.

% Nd. 235,905. Patented Dec.- 28,1880.

7 Q/A E UNITED STATES PATENT prion.

MICHAEL SCHULTZ, OF CINCINNATI, OHIO.

STEAM-PUMP.

SPECIFICATION forming part of Letters Patent No. 235,905, dated December 28, 1880.

' Application filed August 20,1880. (No model.)

. To all whom/it may concern:

Be it known that I, MICHAEL SCHULTZ, a citizen of the United States, residing at Oincinnati, Hamilton county, Ohio, have invented new and useful Improvements in Steam- Pumps, of which the following is a specification.

My invention relates to direct-acting steampnmps employing a fly-wheel for regulating their movements and a yoke device for imparting motion to said fly-wheel, andis in the nature of an improvement upon the invention for which Letters Patent Reissue No. 8,798 were granted to me July 8, 1879. Said patent describes a direct-acting pump in which the steam and pumping cylinders are arranged in the same axial line, with the yoke device between them engaginga roller upon the crankpin of the fly-wheel shaft, instead of the old sliding box commonly used in the Scotch yoke. In the construction of the pump therein described I have heretofore used a steel roller, and harden the faces of the yoke-slot between which it plays by a chill in the casting, in order to prevent wear of the parts and lost inotion; but it is found by experience that this method of construction is not altogether satisfactory, as the chill cannot be produced deep enough to allow the necessary grinding and truing of the faces. The rolling action of the roller tends to condense the metal of the yokeslot at the surfaces exposed to pressure and produce an enlargement of the slot almost equal to that produced by the wearing friction of a sliding box.

The object of my present invention is to remedy this difficultyand at the same time avoid the cost and trouble of chilling and hardening the inner surfaces of the yoke. 7

To this end my invention consists in facin g the wearing-surfaces ofthe yoke with plates of steel or other hard metal, and in the mode of applying and retaining them in position in the yoke,'thereby improving and rendering more durable and efficient the pump or other machine employing a yoke device of this nature.

My invention is embodied in mechanism illustrated in the accompanying drawings,in which- Figure 1 represents a front view of the yoke,

one-half in section, and Fig. 2 an end or side view of the yoke.

Similar letters indicate similar parts in the several figures of the drawings.

A in the drawings indicates the crank-plate; B,the crank-pin; O, the roller D, the yoke, and E E the piston-rods of the pump and steamcylinders respectively.

The yoke D is divided .in two parts, d d, horizontally on a plane passing centrally through the rectangular opening or slot in which plays the roller (J or the sliding box, as the case may be.

In my construction ofthe parts as described and claimed in my said former patent each half of the yoke D and its contiguous pistons E E are formed in one piece, being secured together as one whole by 'bolts lB passing through the adjacent ends of the parts 01 d constituting the yoke D.

In my present improvement I dispense entirely with the process of chilling the inner faces of the yoke and of grinding and facing those surfaces after casting, and in lieu thereof I cast the parts of the yoke with a rectangular aperture, G, flush with the slot-surfaces and extending longitudinally through the ends of the yoke, crossing the bolt-holes at right angles, and insert in these apertures steel plates H. (Shown in edge view, partly in section and partly by dotted lines, in Fig.1.) These plates, being fitted to the yoke and provided with holes at their ends suitably spaced,

are firmly secured in position and held by the bolts F, which pass through the plates and hold the parts d d of the yoke together. As these plates are easily prepared by cutting off proper lengths of bar-steel and punching the holes, the substitution of them in the yoke not only improves the structure by rendering it far more durable, but economizes the first cost and facilitates repairs in case removal and replacement should be necessary? They may also be reversed in position end for end or by turning over, so as to present an uneven surface to frictional contact, thus securing great durability.

It will be readily understood that the plates may be inserted in a yoke of any construction, whether employing a sliding box or roller,

and also that the benefits of myinvention are not confined to steam-pumps, but may be applied in machinery of any kind where a yoke device is employed for converting reciprocatory into rotary motion, or vice versa.

Having described my invention, 1 claim and desire to secure by Letters Patent- 1. In a steam-pump or other machine employing a yoke device for converting reciprocatory into rotary motion, or vice versa, a yoke provided with removable and reversible steel or other hard-metal plates for the interior wearing-surfaces of the slot, substantially as and for the purpose specified.

2. In combination with the yoke D, theplates H, of steel or other hard metal, secured in position by the bolts F, substantially as set forth. 3. The parts 61 d, forming the yoke D, cast with apertures G, in combination with the plates H, as and for the purpose specified. 4. The yoke D, provided with removable and reversible steel plates H, in combination with the roller 0, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

M. SCHULTZ. Witnesses:

L. M. HOSEA, L. E. HOSEA. 

